Quote:
Originally Posted by Berean
You can always go higher, but should never go lower.
Lower octane in cars not designed for it will cause engine knock due to fuel ignition outside of the combustion cycle.
You wouldn't think so, but lower octane fuel will ignite more easily, which is why it's not used in high compression engines.
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In newer cars the engine has sensors that detect knock and will retard the timing accordingly so the engine isn't damaged. So you probably could run lower grade in there, but I would avoid it.